3 Application Interface
Copyright © Fibocom Wireless Inc.
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3.4
USIM Interface
The FM101 module ha
s
Dual SIM (one embedded eSIM and USIM interface). USIM interface
supports 1.8V/3V SIM card.
3.4.1
USIM Pins
The USIM pins description is shown in the following table:
Pin Pin Name
I/O Reset Value Description
Type
36 UIM1_PWR
PO -
USIM power supply
1.8V/3V
30 UIM1_RESET
O
-
USIM reset
1.8V/3V
32 UIM1_CLK
O
-
USIM clock
1.8V/3V
34 UIM1_DATA
I/O -
USIM data, internal pull up(4.7KΩ) 1.8V/3V
66 SIM1_DETECT I
PD
USIM card detect, internal 390 KΩ
pull-up. Active high, and high level
indicates SIM card is inserted; and
low level indicates SIM card is
detached.
1.8V
3.4.2
USIM Interface Circuit
3.4.2.1
N.C. SIM Card Slot
The reference circuit design for N.C. (Normally Closed) SIM card slot is shown in Figure 12: